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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344e9aa034ca0cb1f68d6c8a8f6b2f2ff62a6a3ffeb1d7d0ac4d3b2365009a70' 
  AND token = '0tcqgqBjKk8SaLZ+Q0bZdT8iJJd4U2kaxh3jmaQe5Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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