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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec862dfce1c9ffe487db80de52afc032602a4902e32bdbc4c72c30004c099650' 
  AND token = '72HU6e/FQ/BylfI8vh3kvqugdZC7XJG0jsieBdR+6xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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