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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e797bb9df387ea86222f01aba4b81919df4afc5ebcb80ce8d477e36453b64c98' 
  AND token = 'MwSdP1RooGKrekVwCXSLVyeGQJ+H6Akxglol9zcSsM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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