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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd150c3feeb752001dd89afe0f64b42372cad463d93e9f4621796c39c94139d' 
  AND token = 'QzEtsA/FHhA4/tgLiOmTa+WZIgflSa1E5roFkFTF9LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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