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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39847ab093829e014223739dc10d98037d8234f78a7ffe11684eb6ab7709b53' 
  AND token = 'VwExlIT+ph942kX9aR+TxQAOJjCEUmS2RIV+59aXDu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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