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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080f651130a1ed611198b54cdb22c77c45fe14d216384044d1889ea2f704724f' 
  AND token = '3fjtpHOXIdImmp1LfjLM60H+9oKUHb84ErgncmMuEzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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