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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843c0195e50762b6b5389e6a4c4cf523d847305d5f0bbb8e0c6f6407abf953b0' 
  AND token = 'X1YGw88BserfADRVY84zCS3h6zXk86ebfXQcFHKUeXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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