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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b3006460d91e918d547df5fb6789a3019541881de9f9444c525268fbb9f5cf' 
  AND token = 'YtHfrFgC7I9W4GPH8eq+uTyO89kYr0T1bD7Vpvprbs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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