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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd941fbecac94fff4fbbb04b6e2875ef1bbd1eaee487d5fcd9a14ced390decee5' 
  AND token = 'HWQZ/k7UbpSv7FV4OjWVWqwACPdbL2ilExk5EzLoQpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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