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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5982b1feb2a97fd3986e1c5e6c41c31f865e95b37dde54300fe663ef57b025' 
  AND token = '6hL5kuH5ZPQv3crO1QYoAHSSkKmXTZuNG5SEDVUwNaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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