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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5d6662b6ada17ef987b146826f0e04f506c51eb1e5d53bb718b10ea3922b57' 
  AND token = 'cVEz+AQNJzicHkJUE1i8wu0EPYYemV3qru/9R01egiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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