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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08a779da319b1e8728d3d739af294c8b3bb7feda49d40f2742f99575b4d405b' 
  AND token = 'Lp3EI6ecLKpFW4Z2cTZBKD7WiB8x6zoHn6o4rZi/Xwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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