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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ad5d532373943714876712f6ddfdf3b8659dcb736cfccbc97423874f281626' 
  AND token = 'h/H80sC7krb30H59YPzY0ymLEM80EoxrIMLxQUPsOnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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