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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a792e34e136fa4f1c91c7a00d726358692bb0c58d642909b74e6e26f3646d4af' 
  AND token = 'huI6vzS73SNvZPtxYoWMpNEfLYqIqJwoM69Apr+nsoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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