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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12abb1ce06aaf07c7ba2f94b36db0c92cd4bcc9d5bc2e70bf11e87b103107be' 
  AND token = 'Iuu+vp5cokfZ2drgAun1nUPBfc2FWQXobajgnHczYoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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