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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b05e100ae4b1ff87bd5c0f2faaded12376d5aedc28d133ecc905a698c515ddb' 
  AND token = 'wrGgCkgtw1+ogcyia6J3xgaiz0eyb21X+H1IugsIbn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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