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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0109eb38eb4a496ef1b6bfd7c7eb4c69a1e93bbab4e6d76d2c415295cc386fdc' 
  AND token = 'WBJiatjc2dIt0I52jkQ3UJ0i+7FE8+NPNuvMdGXww40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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