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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c786b880f4ab23e5f0f6ad2a24d3e7e65fb1b1c6fb2a95ac3e12b937613ce28b' 
  AND token = 'X4ntg+AtNNhGdFRZqNt9QC1y1F4Iha0/POICdUP3ShU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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