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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e203e91840550203b63b92435558bc293e5a604b2a5311fc1d1ab29d47d34fed' 
  AND token = 'DCRM3Z9XnNNKLl+K0O+pd4BbSYgfAQDCuKsBozzkZZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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