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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b77cf3fd66c9a9a7b49b9d3a07e6eb0405db86020e483d4c2949bcf7b87016b' 
  AND token = '5AoGBALHtHjCN/CPcbjLgL3dRUxesaiZSKDCG9ES1Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}