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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2eb0c21d61d3f39f324b69e70ef323a59f3b7319cd4abfe5d16e87905fecf3' 
  AND token = 'LlD6gZK4Zp7SvWRcbV3mMUJA1QSWE7ZD7pvyNUAu3WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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