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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a10dcc0c11f2033e378caa221b8df42819ca7f97d5c046930cbc8b7c10bb05c' 
  AND token = 'nGM4q2B8VJwPvvV+7Gy8mpEcY5x8kHtNXAJAg9bVX7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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