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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcc7f3dd66a3b84c2a0837a3e891fa75b4eec0fe9f51ee0bacb53627907384c' 
  AND token = 'dKO7nffY9Fs5G0oU2bGnh0ekwZzdq0vYrfAI9gFq48k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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