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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc029c71762ae83e55a14f05e12202eeb6c1174a9ff11a8cc629d6dc62c8007' 
  AND token = 'OvUSfXpH7jiOPORq3nj3WtrBKyIy0IiXVcmcQQ7c66c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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