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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a518f4ad8f86415eeec116540ccafc62a79cd345cd5e5a0be070606c31ea971' 
  AND token = '6+FTtayL4aRNRuJ9gnuzfhau8CR6oa3hjZVTh/i8+qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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