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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a2adb6117d9e624d6d8f2f7b5075090cabf4fd46c2d4f8fa15b17ad72f3063' 
  AND token = 'wcVcCdrQUcvYEVzsysbBB5LWfVLTRYKAFGe96b7+3Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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