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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf64eec8e619716d6a5b7c6597486812285fd0414defb375276046c0371f70c' 
  AND token = 'ElvG0u0UY6IeSBo4fK5rCHrvG1j1vod96hwA9zxvwQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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