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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cffa128815ff43fbdd64e69be4a249a894f77c0438d1721bce5c3bbcd8c24a' 
  AND token = 'ENY9dsdzxJ/mxEmv0BIx5SDP3tVASyXtn1LwtMNwzZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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