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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac02072cb8d468f5480434843a4cb52910d26bf54d8eb10d886c7e8bec21820' 
  AND token = '/Qj/n/jKncZlL/C8yuN491yH7uIYp0abGk211KSPvvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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