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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62802b71b88b5559ea05d9685b093263b06b85c4a1cbdf2616f5d343e923b31' 
  AND token = 'HxCBY/OVNh0W5UOtn82s1efINe6HFdA4v7POXvEl2wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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