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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d2d2f5a4266eec4de8b97020136a1c2e51add3a1259e8198e9e4b2cea0f975' 
  AND token = 'UHullbPzV/JAfzkyIH/Cc5SUsI3MfgES/vGjctwWnk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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