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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b5349021a4a7896d09c24c05d5be9d934c59dd8dd934b9aa137ffb516f95ee' 
  AND token = '9BoEBbzaQvsJmImzD65s+AbYi7HCDqWyJRXLgjYi4l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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