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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca5e2dc6f7342a0e843aa7fd99d93689164b85c08c301c309b3e62197bfd107' 
  AND token = 'A92dzVy8N7qrOfJGB03rijTgZjTaJKhif1LTnz7hdQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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