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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9625f53790212940e7f9187845426024d905ee3eb6c457fc1b9b1b07f6f6c8' 
  AND token = '3U2+mSPIes7/gsllLBAcYDtM2Vnc33Zgi9xkfhslpks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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