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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fcaf333b6a6fd339cc657053ff33d1a82a0854258228f532d15c5a6d5d7d99' 
  AND token = 'ZKLEI8MBJiJRfNXkdpXtlRtWh93wtcqG1w3QT9qb4gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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