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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec7953acb48fbfc87c99650c5ede8f0a4d493d72acbfc2fdf65b03631ae117e' 
  AND token = 'PuWgi726YW4BRAJh5OE5k99tpl4pJrj4BMH3QD0JK3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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