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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d0be436afb78a2ec9024c00708bdd4749c4a89fd8f862f5dd29d270f7de953' 
  AND token = '3pObTy4TmhHeMycMW/UHyXk2i3SO+5109Ap7WpaYmRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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