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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8863cf9ad771b55a8d72c560f97e172075249ce62242ba4bf6b340b4f473d5' 
  AND token = '+fwtLrs5Goj2Xe6AkOggQUCnShRtOQrd04KP7qs0Vjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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