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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a163be0c6d38ffe722957a542873438963665fd845e250b9733f09301567a0c' 
  AND token = 'oRcCWJApqttjioiLYBIbibGONLGOF2WWMoxVAncThz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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