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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de1ff801177c1c4adde1a19c387c7a9f04f9179492f20405116fa9fe355a193' 
  AND token = '/nnkNqzvUM37aRBsVKp+oT5jnXH60nqRhzIy037oUDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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