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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b186880c3cf1d38ad72c3cf95eaf83ae1fcbf4e0a7258ca7c4c3b84ca844b111' 
  AND token = 'rjosAgWVn5FH09s89Ak0+Z+zNXzEGFyr+EaAUHPd2+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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