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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3b6435be6b9b3d8df5c024a70e08e8769bb4fe5f6553cb984437668ab8ffc3' 
  AND token = 'BmaRW9bg9AvVpP2NkWM7G00dudRgQqs87fAw4thCa/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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