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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0762e1c853062ac28be91d2a8fca1d8b0cfd5301998cd500a963f9cf66d51df6' 
  AND token = 'kmFu80LNIw3fF2E4BcOO7jXfwH0ASPXNzYPIlx/eVO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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