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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f16e4b40be108938ef189553f7fe53f81119885b30f3686c8f19d29c70859d' 
  AND token = 'f//AMocaoFdgTbKXK9a5orExfo3IkuCJHDCCyR+kFjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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