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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd4e101142e7decf26b2500263fe9d8aa9d9f99c628a41c0ec71247b1c89375' 
  AND token = 'e9jGh/comlQ9WXfxw2AMtyvbaLTr/UHkBuU8/frQV1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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