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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d8a71b57c777157cafba620e5095b71f2b045a68e97040b4d1b5a9922b15b6' 
  AND token = 'LdKIAnaahCA7/4EAihkQbwrdsq/O2cyDAC0iDK5SRbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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