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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0a5419248469f2d9a4f3a73f70176660d68372ea558061450b8c92d0682a98' 
  AND token = '6GoYIlayfRDuX+cYy7Rn71L2s4tAp6Fg/u3AZfLXJ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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