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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572a7025e02a273b1577c16972b3abf4e2f838c21df08f4b5570767f01a87fd2' 
  AND token = 'hLZRCPWzZbw1iE5HJ1xx+p67uaMOtwCfyesJlokKIYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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