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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ba2c47fc6fe9e6ab2164f4106ee0bd9f6cc6cc7ca1f6f0b68660225f8ba3ae' 
  AND token = 'WHEBDy+PxaD5oi/iUs5wm464i9fOtXKViA8YhcN6z+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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