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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d995c90c7fb3dba12685212ea8b573d62c8d7918bd6e6157bdbd67257dbe160' 
  AND token = 'I7N40vpRim7epJrz/7Ph7CkABGiu5iGWobpSIoi0BMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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