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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae4a694e46e068bcf755b9d1047cd112f2dd3c8edf593780aa05639e8aa6430' 
  AND token = 'TrKG1BWKGE2YWh6bIQV70Ch4n49qN+Wx06RQzNklRxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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