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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f082fa7dded302b7dc9e9f2c41d1712fa285627c94007351972d0af68131ed56' 
  AND token = '7MGarBW7RU3SrXY/WXkTQiG71aHt6tShAO11yMSQiFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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