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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b5ba5d1031761be4c101ae20e18a59abb0b5f342bebfd2385468dc2c537186' 
  AND token = 'k+xGaDXdNZll8vLcb2Cqo1qRIMhZ7BLyLLc6SHFAWh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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