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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3db3fa6c7827df77e1b5de05c57e3eeb69e945275328efe3f10e4909dbec3a' 
  AND token = '2AjrlIbigzH6OLEoqciYb2aPpZP2H952HNMZSTIkSxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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