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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3abc2dad37e0b0cd88a6845cb074ce6be5031a42505f85d47bdf0dc3e50197e' 
  AND token = 'wW388MuP+WT2hYfy2Xt01ZC4PecmZHcdOQkmwEzlJTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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