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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177c19e3dcceae277878c8b804f46fdc996cb1f7a8aa87bdf9e52cbd7544c9ae' 
  AND token = '7W7eoAyYZkcF6cT8hVgtwKBxlsDe4HGKzc9Khgs+Lxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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