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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed0f1f151dc7556d47dde908fe82cbe72ae9fc63a1208817dc966a953a492ed' 
  AND token = '6mjdtqmLOmB+nYeLq+rzuQmab/8lYxtAVzfcRUEwFcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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