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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75eab4c7d2d1fbed5d61a9d6cce9620f1f925a560eb6ad4709c578cdc742a15' 
  AND token = 'jyIsWwJvN4kyKWAGxLJpdXZ+MTYsWIGPBELftGdq4kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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