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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b861312e880a98a153c352d4080233e001301dfe1177f8acf3b809305ef0a6eb' 
  AND token = 'h/IyNTlL7/cHS4nKkxScevpyeBpURo1vV/6h1orejeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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