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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06e3f1f0428d854a2fe3d44a2d79ea0a4948845265083302746f9fb2c051010' 
  AND token = 'c+ECMnau6Upf2Cp4e7B28uqkJyK9iSWXBQXqsDePIt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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