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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0757cbdcdc3919bb10c621dc4980a92d572debbb77a9d1acb38cea975cdee8b' 
  AND token = 'NYE6seBRpKJ4WQhs7s+M133tQSi5UoBj211RHRiA3X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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