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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e898642f80e2d62b4b9219c901d7014858b7ce9748ba8c54881a934bbe29e3' 
  AND token = 'fyPq4wH8zQt5nQ5uDunYqfKLdMThAmczJ4FeFNnV62Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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