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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010c6362689e7b24278e271835ee7099f24508acbae4d11d8a1eceefac5654e1' 
  AND token = 'sd7IdBvHUWIg/IWF5a00yi4swRRsZ9U/ZUDZWziluTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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