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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801c8a25e04629531ff051dffb47f26006991951cb48d1bd527bc6b0f685c45a' 
  AND token = 'oovC6kwfDLFW31Ho3y4bdIwCVDd1qDoRE7naCBMG0NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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