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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8152f70bfd7b194cd60e2054a64354ee04ef8c49a3d448c30e2622e9c3654b04' 
  AND token = 'azlFmKvGfSIC7AJKJimcueTk2AdmNdnoLHOh54kcy+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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