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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec92f4fe9f7ae7afe395087ba96db3a033b05a5950a35578c873f0e04005bd0' 
  AND token = '7hpDziZ26gSeOHwPG2GsUEgMVPrIoA4lvszE565nj1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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