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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04d22f7d443ce3982ed8de7adc6599b77a84825461529db57cd3ddb2f57395a' 
  AND token = 'vCUc0+jbl77/vR0IILSiz+SwrZaeLlDuKtzBLZ75ikI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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