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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b89f20f821674a8706fb9e541ea48b47436443a4acfdad81922682f15317f3' 
  AND token = 'VHq7JM4HnkDXs9mWU768c5CvUUYqBABiV8vY4D2J9i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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