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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e09e6fde32ed576a684ce86e576b4a2c8b1b696ec03c9d9e5ac83561dca693' 
  AND token = '8Ad03KVjH0nY6LxQGc6v7h2OhAV+DAsHI4g2Qbvg9Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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